p:empty{
    width:100px;
    height:20px;
    background-color: #ff0000;
}
p:first-child{
    background-color: yellow;
}
p[class^=t]{
    background-color: aqua;
}
p:first-letter{
    font-size:200%;
    color:blueviolet;
}
p:first-line{
   background-color:  plum;
}
p:first-of-type{
    border:2px dashed black;
}
:-moz-full-screen{
    background-color: bisque;
}
button{
    padding:20px;
    font-size:20px;
}
input:in-range{
    border:2px solid blue;
}
input:indeterminate{
    box-shadow:0 0 1px 1px red;
}